Idea... Get ceramic,wrap the pitot tube in several layers of bid soaked in plaster or even grout material until it's about 1/4 - 1/2" thick. Let dry hard then wrap with epoxy wetted bid and install. Should be enough outside insulation to keep the heat away from the epoxy. James Redmond used phenolic to wrap his.

Just got the G10 - heavy dense stuff 3.25x3x1.75 and UHMW plastic or whatever it is called - found a great local plastic co, came from the scrap bin and put money in the tip bid, now off to the tool store for belt and disks for the darn aluminum